How the numbers are worked
Concentration is the vial quantity divided by the water you add. Enter the target in mcg or mg — milligrams are converted to micrograms (×1 000) before the draw is worked. That target is then divided by the concentration to give the volume to draw. Marks on a U-100 syringe are that volume multiplied by the marks on the barrel (100 marks = 1.00 ml). Quantities per vial is the vial divided by the target.
Worked example: 5 mg in the vial, 2 ml of bacteriostatic water, a 250 mcg target, U-100 1 ml syringe → 2.50 mg/ml, 0.100 ml, 10 marks, 20 quantities, 1.00 ml capacity.
This calculator converts units. It is not medical advice, not a protocol, and not a recommendation to use any peptide. Peptide Data publishes research-use reference material for a UK audience. Bacteriostatic water, syringes and lyophilised peptides are laboratory supplies; nothing on this page is an instruction to administer a substance. If a figure looks wrong, check the vial label and the syringe you are holding — the machine only knows the four numbers you typed.